JP2007239804A - Anchor bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor bolt capable of fixing a structure with a robust strength for a long period of time in an environment marked by slight earthquakes. <P>SOLUTION: The anchor bolt comprises a core body 2 which elongates in the up and down direction and a cylindrical body 3 inserted by the core body 2. The core body 2 comprises a bulged portion 22. The cylindrical body 3 has its inside diameter which is smaller than the outside diameter of the bulged portion 22 and its lower portion is a diameter extended part 31. When the anchor bolt 1 is inserted into the anchor hole and the core body 2 is lifted up, the bulged part 22 breaks into the inside of the extended diameter part 31, while moderately denting and the internal stress stands behind the bulged part 22 and the diameter extended part 31 expands and the outer peripheral surface is brought into contact with the anchor hole. By this way, even if the anchor hole should have a play, the diameter extended part 31 is further expanded by the internal stress remaining in the bulged part 22 into contacting state to maintain the contacting state. Thus, the anchor bolt 1 can be safely fixed for the long period of time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anchor bolt, and more particularly, to an anchor bolt capable of fixing an object with a strong force for a long time even in an environment with slight vibration.

  Conventionally, anchor bolts are used when installing various structures. For example, when installing an outdoor unit or the like of a vending machine or an air conditioner, first, an anchor hole is formed in the installation surface of concrete or the like, and an anchor bolt is inserted into the anchor hole. And an anchor bolt is fixed to an anchor hole. Finally, the structure is fixed to the installation surface by attaching the structure to the anchor bolt.

Thus, an anchor bolt is utilized as a member for attaching a structure by being fixed to an anchor hole. Therefore, if the anchor bolt is not firmly fixed to the anchor hole, the stability of the structure is deteriorated. Therefore, the anchor bolt must be firmly fixed to the anchor hole. From such a point, an anchor bolt that can be firmly fixed to the anchor hole has been proposed (for example, see Patent Document 1).
Japanese Patent No. 2544021

However, the conventional technique has the following problems.
FIG. 5 (a) is a one-side sectional view showing the structure of a conventional anchor bolt including the anchor bolt of Patent Document 1, and FIG. 5 (b) shows a state in which the anchor bolt is fixed to the anchor hole. It is the one side sectional view shown.

  The anchor bolt 9 includes a bolt 91 and a cylindrical body 92 inserted through the bolt 91.

  The bolt 91 is a substantially cylindrical member that extends in the vertical direction. A screw groove 91a is formed in the upper outer peripheral surface, and the lower outer peripheral surface is a tapered surface 91b that gradually expands toward the lower end. .

  The cylindrical body 92 is a substantially cylindrical member that extends in the vertical direction, and has a plurality of cuts formed in the lower portion thereof, and can be deformed by applying a force in the radial direction. The cylindrical body 92 has an inner diameter smaller than the diameter of the tapered surface 91 b of the bolt 91.

  When fixing the anchor bolt 9 to the installation surface, first, the anchor hole A is formed on the installation surface using a predetermined machine. Then, the anchor bolt 9 is inserted into the anchor hole A. Next, a pressing cylinder (not shown) having substantially the same diameter as the cylinder 92 is inserted into the bolt 91, and the cylinder 92 is driven downward through this cylinder.

  Thereby, the taper surface 91b of the bolt 91 enters the inside of the cylindrical body 92, and the lower portion of the cylindrical body 92 expands in the radial direction. And the anchor bolt 9 is fixed to the anchor hole A by fitting so that the expanded part may enter the inner peripheral surface of the anchor hole A. Finally, a structure is attached to the bolt 91 protruding upward from the anchor hole A, and the structure is fixed to the installation surface.

  In this case, although the anchor bolt 9 is initially fixed to the anchor hole A, as the time elapses, it comes into contact with the cylindrical body 92 due to vibration of a structure (for example, an outdoor unit of an air conditioner or a vending machine). The inner peripheral surface of the anchor hole A becomes brittle and is destroyed in some cases, and a gap is formed between the cylindrical body 92 and the inner peripheral surface of the anchor hole A. Therefore, the force which fixes the anchor bolt 9 will weaken, and a structure will wobble.

  Moreover, since the lower part of the cylindrical body 92 is deformed into a tapered shape that gradually expands downward, there are many portions that are in line contact with the inner peripheral surface of the anchor hole A, and the contact area is small, so the anchor bolt 9 is fixed. Power is weakened.

  Further, when the cylindrical body 92 is driven, the cylindrical body 92 moves downward while destroying the hole wall of the anchor hole A, so that concrete fine powder or fine particles are generated. Therefore, the fine powder or fine particles are present between the anchor bolt 9 and the anchor hole A, play a role of lubricant or abrasive, and contribute to the loosening of the anchor bolt 9 at least.

  The present invention has been made in view of the above, and an object of the present invention is to provide an anchor bolt that can fix a structure with a strong force for a long period of time even in an environment with slight vibration.

  In order to achieve the above object, the anchor bolt according to claim 1 has a bolt portion extending in the vertical direction and a hollow bulge-shaped bulge portion provided below the bolt portion and having an open lower end. A cylindrical body that extends in the vertical direction and is inserted into the bolt portion, and has a plurality of cuts formed at a lower end thereof and a diameter-expandable portion that can be expanded; , Provided.

  That is, in the invention according to the first aspect, since the bulging portion is hollow, an appropriate strain can be generated in the bulging portion, and the expanded diameter portion can be expanded while accumulating internal stress. For this reason, even if the anchor hole becomes idle due to long-term use, the pressure contact state is maintained by releasing the structural internal stress remaining in the bulging portion. Therefore, the anchor bolt can be stably fixed for a long period of time. In use, anchor bolts can be inserted into the anchor holes, and the core body can be pulled up with the cylinder fixed, so that fine particles or fine particles are generated without scraping the wall surface of the anchor holes. do not do. Since the bulging portion is hollow, the pulling force can be smaller than when it is solid.

  The anchor bolt according to claim 2 includes a core having a bar-like portion extending in the vertical direction and a hollow bulge-shaped bulge portion provided below the rod-like portion and having a lower end opened, and the rod-like portion. Is a cylindrical body that extends in the vertical direction and has an upper portion that is a bolt portion, and a lower portion that is formed with a plurality of cuts toward the lower end and is a diameter-expandable portion that can be expanded. And a cylindrical body.

  That is, in the invention according to claim 2, since the bulging portion is hollow, an appropriate strain can be generated in the bulging portion, and the expanded diameter portion can be expanded while accumulating internal stress. For this reason, even if the anchor hole becomes idle due to long-term use, the pressure contact state is maintained by releasing the structural internal stress remaining in the bulging portion. Therefore, the anchor bolt can be stably fixed for a long period of time. In use, anchor bolts can be inserted into the anchor holes, and the core body can be pulled up with the cylinder fixed, so that fine particles or fine particles are generated without scraping the wall surface of the anchor holes. do not do. Since the bulging portion is hollow, the pulling force can be smaller than when it is solid.

  In addition, after pulling up the core and fixing the anchor bolt to the anchor hole, it is desirable that the portion of the core that protrudes upward from the anchor hole is cut and removed. If it does in this way, the convenience at the time of using a cylinder as a bolt is good.

  The anchor bolt according to claim 3 is the anchor bolt according to claim 1 or 2, wherein the bulging portion has a substantially cylindrical shape, and the cylindrical body has an outer diameter of the bulging portion. It has a substantially cylindrical shape whose inner diameter is slightly smaller.

  That is, in the invention according to the third aspect, since both the enlarged diameter portion and the bulging portion of the cylindrical body are substantially cylindrical, when the enlarged diameter portion is widened by the bulging portion, the enlarged diameter portion is substantially cylindrical. Expands into a shape. Therefore, since the enlarged diameter portion and the anchor hole are in surface contact, the contact area is increased, and the anchor bolt can be fixed with a strong force.

  The anchor bolt according to claim 4 is the anchor bolt according to any one of claims 1 to 3, wherein a locking groove or an unevenness is formed on an outer peripheral surface of the enlarged diameter portion. And

  That is, in the invention according to claim 4, the anchor bolt can be more firmly fixed by the locking groove or the unevenness of the enlarged diameter portion.

  As described above, according to the present invention (Claims 1 and 2), the anchor bolt can be stably fixed for a long period of time. According to the present invention (Claim 3), the anchor bolt can be fixed with a strong force. Moreover, according to this invention (Claim 4), an anchor bolt can be fixed still more firmly.

  FIG. 1 is a front view showing a configuration of an anchor bolt according to the present invention. The anchor bolt 1 is inserted into a predetermined anchor hole and fixed, and is used as a mounting bolt for fixing a structure. The anchor bolt 1 is inserted through the core body 2 and the core body 2 extending vertically. And a cylindrical body 3.

  FIG. 2 is a cross-sectional view showing the configuration of the core body 2. The core body 2 is a longitudinal member that extends in the vertical direction, and includes a bolt portion 21 that extends in the vertical direction and a bulging portion 22 that extends downward from the lower end of the bolt portion 21.

  The bolt portion 21 has a substantially cylindrical shape, and a thread groove is formed on the outer peripheral surface thereof. That is, the bolt part 21 is a part that functions as a bolt.

  The bulging portion 22 includes a substantially cylindrical pressing portion 221 whose upper portion is closed, and a locking portion 222 provided below the pressing portion 221, and has a generally cylindrical shape as a whole.

  The pressing portion 221 has a substantially cylindrical shape with a larger outer diameter than the bolt portion 21 and has a constant thickness.

  The locking portion 222 has a substantially cylindrical shape with a larger outer diameter than the pressing portion 221, and has a larger thickness than the pressing portion 221. Further, the inner peripheral surface of the locking portion 222 is flush with the inner peripheral surface of the pressing portion 221.

  That is, the bulging portion 22 has a structure in which the inner circumferential surface is flush and the outer circumferential surface has a larger diameter on the lower side in two stages.

  FIG. 3 is a cross-sectional view showing the configuration of the cylindrical body 3. The cylindrical body 3 is a substantially cylindrical member having a constant thickness, and its inner diameter is larger than the outer diameter of the bolt portion 21 of the core body 2 and slightly smaller than the outer diameter of the pressing portion 221. These are parts inserted through the bolt portion 21. Further, the lower portion of the cylindrical body 3 is an enlarged diameter portion 31.

  A plurality of locking grooves 311 extending in the circumferential direction are formed on the outer peripheral surface of the enlarged diameter portion 31. The enlarged diameter portion 31 is formed with a plurality of cuts 312 extending upward from the lower end thereof, so that the enlarged diameter portion 31 can be deformed in the radial direction.

  FIG. 4 is a view showing a method of fixing the anchor bolt 1. When the anchor bolt 1 is fixed, first, the anchor hole B is formed on the installation surface using a predetermined machine. The anchor hole B is formed so that its inner diameter is slightly larger than the outer diameter of the cylinder 3 of the anchor bolt 1.

  Then, the anchor bolt 1 in a state where the cylindrical body 3 is inserted into the core body 2 is inserted into the anchor hole B so that the bulging portion 22 of the core body 2 faces downward (see FIG. 4A).

  Next, the core body 2 is pulled up while fixing the cylindrical body 3. For example, a fixing cylinder (not shown) having the same thickness and diameter as the cylinder 3 is inserted into the core body 2. Then, the core body 2 is pulled up while pressing the cylinder body 3 with the fixing cylinder. At this time, the core body 2 may be gradually pulled up by screwing a nut into the bolt portion 21 of the core body 2 and tightening the nut.

  When the core body 2 is pulled up, the pressing portion 221 enters the inside of the enlarged diameter portion 31 of the cylindrical body 3, and the locking portion 222 is locked at the lower end of the enlarged diameter portion 31. By doing so, the expanded diameter portion 31 is expanded by the pressing portion 221 and the diameter thereof is increased.

  At this time, the pressing portion 221 is moderately strained and enters the inside of the enlarged diameter portion 31 so as to be recessed. For example, the pressing portion 221 is appropriately distorted while the lower end is turned inward. For this reason, the enlarged diameter portion 31 expands into a substantially cylindrical shape while structural internal stress remains in the pressing portion 221. And the outer peripheral surface of the enlarged diameter part 31 press-contacts to the anchor hole B, and the cylinder 3 is fixed. Thereby, since the force which always tries to expand is added to the diameter-expanded part 31, even if it will be in the situation where the play will arise in the anchor hole B by long-term use, the diameter-expanded part 31 will expand further. As a result, the pressure contact state is maintained.

  Moreover, since the diameter-expanded part 31 expands in a substantially cylindrical shape, the anchor hole B and the diameter-expanded part 31 are in contact with each other, and the contact area increases. Furthermore, since the plurality of locking grooves 311 are formed in the enlarged diameter portion 31, the locking grooves 311 and the anchor holes B come into contact with each other, and the cylindrical body 3 is fixed more firmly.

  Further, since the core body 2 is fitted to the enlarged diameter portion 31, the core body 2 is also fixed together with the cylindrical body 3. In this way, the anchor bolt 1 is fixed to the anchor hole B (see FIG. 4B).

  Then, for example, the metal fitting 4 attached to a structure such as a vending machine is inserted into the anchor bolt 1, and the metal fitting 4 is fixed to the anchor bolt 1 with a nut 5 (see FIG. 4C). Thereby, the structure is firmly fixed by the anchor bolt 1.

  As described above, in this embodiment, even if the anchor hole B becomes loose due to long-term use, the diameter-expanded portion 31 is caused by the structural internal stress remaining in the bulged portion 22. Is further expanded to maintain the pressure contact state. Therefore, the anchor bolt 1 can be stably fixed for a long period of time.

  Further, since the enlarged diameter portion 31 and the anchor hole B are mainly in contact with each other on the surface, the contact area is increased, and the anchor bolt 1 can be fixed with a strong force.

  Moreover, since the locking groove 311 is formed in the outer peripheral surface of the enlarged diameter part 31, the anchor bolt 1 can be fixed more firmly.

  The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

  For example, in the above description, a screw groove is formed in the core body 2 to function as a bolt. However, the cylindrical body 3 is formed longer, and a screw groove is formed from the outer peripheral surface, particularly from the vicinity of the central portion to the upper portion. The cylinder 3 may function as a bolt. At that time, the core body 2 is provided with a bar-like portion extending in the vertical direction above the bulging portion 22. Moreover, after pulling up the core body 2 and fixing the anchor bolt 1 to the anchor hole B, it is desirable that the rod-shaped portion of the core body 2 protruding upward from the anchor hole B is cut and removed. If it does in this way, when using the cylinder 3 as a volt | bolt, it is convenient.

  Moreover, the shape of the bulging part 22 should just be a thing of a hollow bulging shape, and is not restricted to the above-mentioned thing. For example, the outer edge may be a cylindrical shape having a polygonal shape. In this case, it is desirable that the shape of the enlarged diameter portion 31 is similar to that shape, and the bulging portion 22 and the enlarged diameter portion 31 are likely to be in close contact with each other.

It is the front view which showed the structure of the anchor bolt concerning this invention. It is sectional drawing which showed the structure of the core. It is sectional drawing which showed the structure of the cylinder. It is the figure which showed the method of fixing an anchor bolt. It is the one side sectional view showing the composition of the conventional anchor bolt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anchor bolt 2 Core body 3 Cylindrical body 21 Bar-shaped part 22 The bulging part 31 The enlarged diameter part 311 Locking groove 312 Cut

Claims (4)

A core having a bolt part extending in the vertical direction and a hollow bulging part provided below the bolt part and having a lower end opened;
A cylindrical body extending in the vertical direction that is inserted through the bolt part, and a cylindrical body that has a plurality of cuts formed at a lower end thereof and is capable of expanding the diameter,
An anchor bolt characterized by comprising: A core having a rod-shaped portion extending in the vertical direction and a hollow-bulged bulged portion provided below the rod-shaped portion and having a lower end opened;
A cylindrical body extending in the vertical direction that is inserted through the rod-shaped part, the upper part of which is a bolt part, and the lower part is formed with a plurality of cuts extending toward the lower end so that the diameter can be increased. A cylindrical body,
An anchor bolt characterized by comprising: The bulging portion has a substantially cylindrical shape,
The anchor bolt according to claim 1 or 2, wherein the cylindrical body has a substantially cylindrical shape having an inner diameter slightly smaller than an outer diameter of the bulging portion. The anchor bolt according to any one of claims 1 to 3, wherein a locking groove or an unevenness is formed on an outer peripheral surface of the enlarged diameter portion.

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